JPH0260285A - Image pick-up device - Google Patents

Abstract

PURPOSE:To pick up the image of a subject whose motion is fast as making it stand still by providing a second scanning means to interlace-scann a picture stored in a solid state image pickup element at every one field period, and switching a scanning means to either one side. CONSTITUTION:The mode is switched to either one side of a field storage mode and a frame storage mode by an external switch 9. When the mode is switched from the field storage mode to the frame storage mode, for instance, when a stroboscope is made flash at an odd field, the video signals of the same condition corresponding to the odd and the even fields are outputted at the odd and the even fields, and when they are taken in a frame memory 3, a still picture free from blurring can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an imaging device having a solid-state imaging device.

[Conventional technology]

Conventional imaging devices, e.g. video cameras, operate in field accumulation mode, i.e., CCD (CCD).
The image output is taken out in a mode in which a solid-state image sensor such as a PLED device is interline scanned and accumulated field by field, that is, every 1760 seconds.

The reason for adopting this field accumulation mode is the frame accumulation mode, that is, the solid-state image sensor
When capturing images of moving objects or by panning or tilting the camera itself in a mode that stores two fields during ec and performs interline scanning for each field, the afterimage is large and the screen This is to prevent flickering.

[Problems to be Solved by the Invention] Conventional imaging devices such as video cameras capture images in field accumulation mode, so that when a strobe is emitted in an even field, the image is not captured in the next odd field. An output signal is obtained, but a video output signal is not obtained in the next odd field, so the video output signal is taken into the frame memory and stored in the frame memory 3.
When the video output signal taken in is displayed on the monitor 4, a time difference of 1/60 sec occurs between the video signals of odd and even fields, and the displayed video is accompanied by flicker.

FIG. 5 shows the timing when an image is captured using a strobe in the field accumulation mode.

One way to solve this problem is to fire the strobe for two consecutive fields, but if you fire the strobe twice in a row, there is not enough time to charge the second time and the amount of light is insufficient. However, on the other hand, when two strobes are used to emit light in synchronization, the device becomes complicated and expensive.

SUMMARY OF THE INVENTION An object of the present invention is to provide an imaging device that is capable of capturing an image of a moving subject as well as a stationary image of a fast-moving subject.

[Means to solve the problem]

In order to achieve such an object, the present invention provides a solid-state image sensor and an image sensor that stores 1
An imaging device comprising: a first scanning means for scanning a field's worth of images every one field period; It is characterized by comprising a switching means for switching to either one of the second scanning means and the first scanning means.

[Effect]

In the present invention, the switching means allows the switching between the first scanning means and the second scanning means.
When switching to one of the scanning means and switching to the first scanning means, the first scanning means scans one field worth of image of the solid-state image sensor every one field period, and the second scanning means When switching to the scanning method, the second
The scanning means scans the images stored on the solid-state image sensor into one image.
Interlaced scanning is performed for each field period.

〔Example〕

FIG. 1 shows an embodiment of the invention. In the figure, 1 is a television camera, and 2 is a CCO as an interline transfer type solid-state image sensor. Reference numeral 3 denotes a drive circuit as a first scanning means and a second scanning means, and in the case of field accumulation mode, charges are transferred every 1760 seconds to each column in two rows, that is, the first, second, and third rows. Charges on the 1st and 4th rows, 5th and 6th rows, 7th and 8th rows, etc. are added to each column, taken out as signal charges, and accumulated in CCD 2 in the frame accumulation mode. Signal charge 1/
It is taken out every 60 seconds. 4 is a frame memory that stores the video output signal from C[:D2. A monitor 5 displays an image based on the image output signal stored in the frame memory 4. ,6
is a strobe, and 7 is an object as a subject conveyed by a belt conveyor 8.

Reference numeral 9 denotes an external switch as a switching means for switching to either field storage mode or frame storage mode.

The CCD 2 has pixels arranged in a matrix, and FIG. 2 shows an example in which the pixels are arranged in 4 columns and 8 rows. In Figure 2, charges are output from pixels in the 1st, 3rd, 5th, and 7th rows in several fields, and in even fields, charges are output from pixels in 2nd, 4th, and 7th rows.
Charges are output from the pixels in the 6th and 8th rows.

In the imaging apparatus of this embodiment, the external switch 8 is used to switch between the field accumulation mode and the frame accumulation mode, so when capturing an image of a fast-moving subject, the field accumulation mode is selected and the other mode is selected. When capturing a still image of a moving subject using a strobe or the like, a frame accumulation mode can be selected.

For example, by switching from the field accumulation mode to the frame accumulation mode as shown in FIG. 4 using the external switch 8 on the camera side, as shown in FIG.
A vertical register transfer pulse is sent every 30 seconds, and a video signal is output. For example, when a strobe is emitted in an odd field, video signals with the same conditions corresponding to the odd and even fields are output, and when captured into the frame memory 3, a still image without blur is obtained.

In this embodiment, an example was explained in which switching to either the frame storage mode or the field storage mode is performed using the external switch 8. It may be possible to switch by a signal.

(Effects of the Invention) As explained above, according to the present invention, with the above configuration, a moving subject can be imaged, and
This has the effect of allowing you to capture a still image of a fast-moving subject.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing an embodiment of the present invention, Figure 2 is a CC
A schematic diagram showing an example of D, Fig. 3 is a timing chart showing an example of timing in frame accumulation mode, Fig. 4 is a timing chart showing an example of mode switching timing, and Fig. 5 is a timing chart showing strobe light emission timing in field accumulation mode. It is a timing chart which shows an example. 1...TV camera, 2...CCD. 3... Frame memory, 4... Monitor, 5... Strobe, 8... External switch. ￥ #F Narama L, Suspo ... / Fig. 1 Fig. 1 Fig. 1 I L Lipse index 1 Nail relocation e? ]Figure 2

Claims (1)

[Scope of Claims] A solid-state image sensor;
scanning means, the second scanning means interlacing scanning the image stored in the solid-state image sensor every one field period; the second scanning means and the first scanning means; An imaging device comprising: switching means for switching to either one of the two.